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Share-based compensation - Share and performance-based compensation expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share and performance-based compensation expense [Abstract]      
Performance-based share expense $ 1,587 $ 1,090 $ 475
Service-based share expense 257 244 603
Stock option expense 0 0 0
Total share-based compensation expense before income tax 1,844 1,334 1,078
Income tax 0 0 0
Total share-based compensation expense, net of income tax 1,844 $ 1,334 $ 1,078
Unrecognized compensation expense $ 2,334    
Weighted average period of expense recognition 1 year